SEO Capsule: Most fundamental conceptual & technical unit in reasoning about and working on organic SEO. It can server as a basis for (a) Planning SEO content, (b) Estimating SEO work, (c) Devising a content strategy, (d) Measuring SEO progress, speed, efficiency, positive and negative effect of time, (e) Correcting SEO mistakes, (f) Tuning SEO content, etc.